<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .sty {
            border: 1px solid #ccc;
        }
    </style>
</head>

<body>
    <div id="app">
        <button>add sub</button>
        <img :src="message" alt="" :class="{sty:bl}" @click="change">
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: '#app',
            data: {
                message: 'https://fanyi-cdn.cdn.bcebos.com/static/translation/img/header/logo_e835568.png',
                bl: true,
            },
            methods: {
                change: function() {
                    this.bl = !this.bl
                }
            }

        })
    </script>
</body>

</html>